in assets/js/slick.js [1989:2022]
    Slick.prototype.removeSlide = Slick.prototype.slickRemove = function(index, removeBefore, removeAll) {
        var _ = this;
        if (typeof(index) === 'boolean') {
            removeBefore = index;
            index = removeBefore === true ? 0 : _.slideCount - 1;
        } else {
            index = removeBefore === true ? --index : index;
        }
        if (_.slideCount < 1 || index < 0 || index > _.slideCount - 1) {
            return false;
        }
        _.unload();
        if (removeAll === true) {
            _.$slideTrack.children().remove();
        } else {
            _.$slideTrack.children(this.options.slide).eq(index).remove();
        }
        _.$slides = _.$slideTrack.children(this.options.slide);
        _.$slideTrack.children(this.options.slide).detach();
        _.$slideTrack.append(_.$slides);
        _.$slidesCache = _.$slides;
        _.reinit();
    };